Hoisting-crane



- (No Model.)

` J. LE DUKE.

HOISTING CRANE. No. 290,074. A Y i Patented Deo. 11, 1883.l

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Umweg STATES-j PATENT om@ i JEREMIAH LE DUKE,- OF BEREA, OHIO.

HolsTIN'c-CRANE.

SPECIFICATION forming part `of Letters Patent No. 290,074, dated December 11, 1883,

' Application filed July 21, 1883. (No model.)

To all whom it may concern/.-

Beit known that I, JEREMIAH LE DUKE, of Berea, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in HoistingCranes; and I do hereby declare the following to be a full,- clear, and exact description ofthe invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in hoisting-cranes; and it consists in certain y features of construction and in combination of balls.

parts hereinafter. described, and pointed out in the claims.

In many places where, in building piers and other mason-work, it is necessary to use cranes orl derricks for' hoisting stones and other heavy material it is very difficult to support the derrick or crane with guys. Familiar instances are piers in navigable rivers and towers built to a great height. My new hoisting-crane is especially adapted to this difficult kind of work, although it may be used to advantage ineordinary work.

In the drawings, vFigure lis a side elevation of my improved crane. Fig; 2 is a vertical section of the same.

A represents a vertical hollow post built in the mason-work and extending some dis! tance below the surface, as shown in the dotted lines, Fig. l. A horizontal arm, B, the brace C, and the brace-rod D, and the carriage E arey all parts that are common to such devices. The post A is provided with the llanges a and a', each provided with an annular groove or chamber, in which operate anti-friction Above these flanges are the flanges c and b, each provided with annular chambers that register with the chambers in the contiguous llanges, respectively, below them. The

` relation of parts is such that the upper llanges operating on the braces, whereas it would be impracticable4 to operate the said tag line either in a stream or when the crane was ata great height. The foot of the brace C having no attachment to hold it rigidly to a given distance from the ange Z, the parts readily adjust themselves so that each set of balls receive its proper proportion of the work. The carriage E may be moved along the arm by the ropes e and e', and held in any desired position, so as to deposit the load near or remote from the post A.

The operation of the device is as follows: The crane is set in the desired place and held Avertically by any means available until the stone=work or other material of the structure Y is built around the post, as shown in Fig. l.

Meantime a guiding-pulley, g, has'been set below the bottom of the post, and a hole left around the running end of the rope g', that leads up through the center of the post and to the tackles. In the position shown the crane is sufficiently supported without guys.

When the structure is built nearly to the flange a by means of thertjack-screws H H, or other means, the post is raised far enough for "another layer of stone or other material, and

thus the crane is carried up with the pier or other structure to any desired height. If the structure is surrounded by water, a boat carrying the hoisting-power may be moored to the pier in such position as to receive the vrope g', and the crane operated thereby successfully. y

I do not claim, broadly, the use of anti-friction balls on cranes; but I am not aware that they have heretofore been used in the manner and for the purpose herein shown.

What I claim :is-

1. In a hoisting crane, a hollow post or column provided at a point intermediate between its ends with a permanently fixed flange :L hollow supporting column held without tion, in the presence of two witnesses7A this 1st guys in the structure being built, of the wheel day of July, 1853. g, adapted to guide the running rope properly to its position on the arm above regardless JEREMIAH LE DDR1 5 of the height of the crane, substantially as de- XVitnesses:

scribed, and for the purpose set forth. ALBERT E. LYNCH,

In testimony whereof I sign this specioa- Clins. H. DORER. 

